SERIES 60 OIL PRESSURE REGULATOR VALVE

An oil pressure regulator valve maintains stable lubricating oil pressure within the engine, regardless of the oil temperature. Oil leaving the pump under pressure passes into the pressure relief valve body. The valve is installed in the end of a vertically drilled passage in the cylinder block, located on the oil cooler (right) side of the block, that connects with the main cylinder block oil gallery. See Figure
20436
.
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Oil Pressure Regulator Valve Mounting

The oil pressure regulator valve consists of a valve body, a hollow, piston-type valve, a spring, a spring seat and a pin to retain the valve assembly within the valve body. See Figure
20437
.
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1. Pin
‪

5. Valve
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2. Pressure Relief Pin Location
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6. Spring
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3. Pressure Regulator Valve Pin Location
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7. Spring Seat
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4. Valve Body
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Oil Pressure Regulator Valve Parts and Relief Valve Details

The valve is held on its seat by the spring, which is compressed by the pin in back of the spring seat. The entire assembly is bolted to the lower flange of the cylinder block and sealed against leaks by a gasket between the block and valve body. When conditions are such that the oil pressure at the valve exceeds 310 kPa (45 lb/in.2
), the valve begins to be forced from its seat and oil from the engine gallery is bypassed to the engine oil pan. Thus, stable lubricating oil pressure is maintained at all times.
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Repair or Replacement of Oil Pressure Regulator Valve

To determine if repair is possible or replacement is necessary, perform the following procedure. See Figure
21750
.
‪

While compressing the spring, install the retaining pin behind the spring seat.

Press the pin flush to 0.254 mm (0.010 in.) below the surface of the valve body.

Note:
The valve body has two retaining pin holes. See Figure
20438
. Install the pin in the outermost hole for the regulator valve. The retaining pin must be positioned correctly so the proper valve opening pressure will be obtained. Although the same casting is used for both the pressure regulator and relief valves, the regulator valve has a slightly larger opening machined into the side. See Figure
20438
.

Comparison of Pressure Regulator and Relief Valve Assemblies

Installation of Oil Pressure Regulator Valve

Install the oil pressure regulator valve as follows:
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Remove all traces of old gasket material from the mating surfaces of the regulator body and the cylinder block.

Secure the oil pressure regulator valve assembly to the cylinder block with two bolts. Torque the bolts to 30-38 Nm (22-28 lbft).